239 lines
8.5 KiB
Ruby
239 lines
8.5 KiB
Ruby
# encoding: utf-8
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module CouchRest
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module Model
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module Properties
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extend ActiveSupport::Concern
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included do
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class_attribute(:properties) unless self.respond_to?(:properties)
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class_attribute(:properties_by_name) unless self.respond_to?(:properties_by_name)
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self.properties ||= []
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self.properties_by_name ||= {}
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raise "You can only mixin Properties in a class responding to [] and []=, if you tried to mixin CastedModel, make sure your class inherits from Hash or responds to the proper methods" unless (method_defined?(:[]) && method_defined?(:[]=))
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end
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def as_json(options = nil)
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Hash[self].reject{|k,v| v.nil?}.as_json(options)
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end
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# Returns the Class properties with their values
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#
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# ==== Returns
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# Array:: the list of properties with their values
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def properties_with_values
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props = {}
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properties.each { |property| props[property.name] = read_attribute(property.name) }
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props
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end
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# Read the casted value of an attribute defined with a property.
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#
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# ==== Returns
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# Object:: the casted attibutes value.
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def read_attribute(property)
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self[find_property!(property).to_s]
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end
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# Store a casted value in the current instance of an attribute defined
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# with a property and update dirty status
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def write_attribute(property, value)
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prop = find_property!(property)
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value = prop.is_a?(String) ? value : prop.cast(self, value)
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couchrest_attribute_will_change!(prop.name) if use_dirty? && self[prop.name] != value
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self[prop.name] = value
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end
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# Takes a hash as argument, and applies the values by using writer methods
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# for each key. It doesn't save the document at the end. Raises a NoMethodError if the corresponding methods are
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# missing. In case of error, no attributes are changed.
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def update_attributes_without_saving(hash)
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# Remove any protected and update all the rest. Any attributes
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# which do not have a property will simply be ignored.
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attrs = remove_protected_attributes(hash)
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directly_set_attributes(attrs)
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end
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alias :attributes= :update_attributes_without_saving
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# 'attributes' needed for Dirty
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alias :attributes :properties_with_values
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def set_attributes(hash)
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attrs = remove_protected_attributes(hash)
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directly_set_attributes(attrs)
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end
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protected
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def find_property(property)
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property.is_a?(Property) ? property : self.class.properties_by_name[property.to_s]
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end
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# The following methods should be accessable by the Model::Base Class, but not by anything else!
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def apply_all_property_defaults
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return if self.respond_to?(:new?) && (new? == false)
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# TODO: cache the default object
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# Never mark default options as dirty!
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dirty, self.disable_dirty = self.disable_dirty, true
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self.class.properties.each do |property|
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write_attribute(property, property.default_value)
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end
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self.disable_dirty = dirty
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end
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def prepare_all_attributes(attrs = {}, options = {})
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self.disable_dirty = !!options[:directly_set_attributes]
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apply_all_property_defaults
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if options[:directly_set_attributes]
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directly_set_read_only_attributes(attrs)
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directly_set_attributes(attrs, true)
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else
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attrs = remove_protected_attributes(attrs)
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directly_set_attributes(attrs)
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end
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self.disable_dirty = false
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self
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end
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def find_property!(property)
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prop = find_property(property)
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raise ArgumentError, "Missing property definition for #{property.to_s}" if prop.nil?
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prop
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end
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# Set all the attributes and return a hash with the attributes
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# that have not been accepted.
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def directly_set_attributes(hash, mass_assign = false)
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return if hash.nil?
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hash.reject do |key, value|
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if self.respond_to?("#{key}=")
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self.send("#{key}=", value)
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elsif mass_assign || mass_assign_any_attribute
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self[key] = value
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end
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end
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end
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def directly_set_read_only_attributes(hash)
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property_list = self.properties.map{|p| p.name}
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hash.each do |attribute_name, attribute_value|
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next if self.respond_to?("#{attribute_name}=")
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if property_list.include?(attribute_name)
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write_attribute(attribute_name, hash.delete(attribute_name))
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end
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end
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end
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module ClassMethods
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def property(name, *options, &block)
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raise "Invalid property definition, '#{name}' already used for CouchRest Model type field" if name.to_s == model_type_key.to_s && CouchRest::Model::Base >= self
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opts = { }
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type = options.shift
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if type.class != Hash
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opts[:type] = type
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opts.merge!(options.shift || {})
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else
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opts.update(type)
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end
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existing_property = self.properties.find{|p| p.name == name.to_s}
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if existing_property.nil? || (existing_property.default != opts[:default])
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define_property(name, opts, &block)
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end
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end
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# Automatically set <tt>updated_at</tt> and <tt>created_at</tt> fields
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# on the document whenever saving occurs.
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#
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# These properties are casted as Time objects, so they should always
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# be set to UTC.
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def timestamps!
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class_eval <<-EOS, __FILE__, __LINE__
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property(:updated_at, Time, :read_only => true, :protected => true, :auto_validation => false)
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property(:created_at, Time, :read_only => true, :protected => true, :auto_validation => false)
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set_callback :save, :before do |object|
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write_attribute('updated_at', Time.now)
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write_attribute('created_at', Time.now) if object.new?
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end
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EOS
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end
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protected
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# This is not a thread safe operation, if you have to set new properties at runtime
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# make sure a mutex is used.
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def define_property(name, options={}, &block)
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# check if this property is going to casted
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type = options.delete(:type) || options.delete(:cast_as)
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if block_given?
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type = Class.new(Hash) do
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include CastedModel
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end
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if block.arity == 1 # Traditional, with options
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type.class_eval { yield type }
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else
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type.instance_exec(&block)
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end
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type = [type] # inject as an array
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end
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property = Property.new(name, type, options)
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create_property_getter(property)
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create_property_setter(property) unless property.read_only == true
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if property.type_class.respond_to?(:validates_casted_model)
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validates_casted_model property.name
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end
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properties << property
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properties_by_name[property.to_s] = property
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property
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end
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# defines the getter for the property (and optional aliases)
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def create_property_getter(property)
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# meth = property.name
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class_eval <<-EOS, __FILE__, __LINE__ + 1
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def #{property.name}
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read_attribute('#{property.name}')
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end
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EOS
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if ['boolean', TrueClass.to_s.downcase].include?(property.type.to_s.downcase)
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class_eval <<-EOS, __FILE__, __LINE__
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def #{property.name}?
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value = read_attribute('#{property.name}')
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!(value.nil? || value == false)
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end
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EOS
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end
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if property.alias
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class_eval <<-EOS, __FILE__, __LINE__ + 1
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alias #{property.alias.to_sym} #{property.name.to_sym}
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EOS
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end
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end
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# defines the setter for the property (and optional aliases)
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def create_property_setter(property)
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property_name = property.name
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class_eval <<-EOS
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def #{property_name}=(value)
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write_attribute('#{property_name}', value)
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end
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EOS
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if property.alias
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class_eval <<-EOS
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alias #{property.alias.to_sym}= #{property_name.to_sym}=
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EOS
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end
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end
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end # module ClassMethods
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end
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end
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end
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